570 TESTUDO HEMISPHERICA. 
The gular scutes are acute behind, and encroach for three-fourths of an inch upon 
the position of the entosternal plate. 
Internally the humeral scutes average eleven and a half lines long, and exter- 
nally join the axillary and the fourth and fifth marginal scutes. 
The abdominal scutes are four and a half inches long, and join the sixth and 
seventh marginal and the inguinal scutes. 
ADMEASUREMENTS. 
, Inches 
Estimated length of sternum, : : 4 : : 15 
Breadth, . , : : ; i ; ; ; 11 
Height, : ‘ . ‘ i : 64 
Length of antero-posterior curve of the carapace (estimated), ; ; 22 
TESTUDO HEMISPHERICA. Leidy. 
(Tab. xii. B, figs. 1, 2. 
Emys hemispherica: Proc. Acad. Nat. Sci., vol. v., 173. 
Testudo hemispherica: ib. 
This species was first established upon a specimen of a sternum with a small 
portion of the carapace from the collection of Mr. Culbertson. 
In Dr. Owen’s collection is a specimen consisting of almost the whole of a cara- 
pace and sternum, but much fractured and otherwise mutilated. It is relatively 
higher or more convex than any of the preceding, and is rather hemioval than 
hemispherical as the name indicates. _ 
The costal plates were still connected by cartilage to the marginal plates at the 
time the animal died. 
There are ten vertebral plates. The first is quadrilateral and twice as long as 
broad. Those succeeding to the eighth inclusive are hexahedral. The second to 
the fifth are nearly equal in size, and the others gradually decrease. The tenth 
plate is a regular trapezium, enclosed by the ninth or inverted V-shaped plate and 
the pygal plate, and is divided at its middle by the last vertebral scute. 
The first costal plate is thirty-three lines long by eighteen broad, and articulates 
with the first, second, and three-fourths of the third marginal plates. 
The lateral marginal plates are nearly vertical, being bent under only in a 
relatively slightly convex manner at their lower fourth. 
The first vertebral scute comes in contact with the first marginal plate at its 
postero-internal angle, where it measures two and a half inches broad. The second 
and third vertebral scutes are of nearly equal size, being two and a half inches wide 
and twenty-two lines long. 
The axillary notches present outwards and downwards; the inguinal notches 
downwards. 
The sternum anteriorly shelves upward, and its margin the breadth of the gular 
seutes, though not truncated, is very obtuse, and posteriorly it is notched. 
